Question

Given a 4.0-nC charge on a 1.0 meter length of an inner
cylindricalshell of radius a = 0.060 m, a -4.0-nC charge on a 1.0
meter lengthof an outer cylindrical shell of radius b = 0.077 m,
& anεr = 9.0 dielectric in between the shells,
(a) determine the potential difference between the
cylindricalshells, &
(b) determine the capacitance per meter length between
theshells.